#558ACE
Closest named color: Dark Sky Blue (#448EE4). oklch(62.7% 0.118 255.3), rgb(85, 138, 206).
Aa
Black text reads best on this color (5.91:1).
About this color
#558ACE is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.118 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.034 away. Black text reads best on it, at 5.91:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.91:1 |
| White text | 3.55:1 |
Values
| HEX | #558ACE |
| RGB | rgb(85, 138, 206) |
| HSL | hsl(214, 55%, 57%) |
| OKLCH | oklch(62.7% 0.118 255.3) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #558ACE | 3.55:1 | AA large text | Lc -68.4 | Content text, not long reading |
| Black text on #558ACE | 5.91:1 | AA | Lc 41.2 | Non-text elements, placeholder text |
| #558ACE text on white | 3.55:1 | AA large text | Lc 62.9 | Content text, not long reading |
| #558ACE text on black | 5.91:1 | AA | Lc -38.8 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CBDBEF
oklch(88.6% 0.033 254)
-
Step 300
300
#A8C3E6
oklch(80.9% 0.058 255)
-
Step 400
400
#79A3DA
oklch(70.7% 0.093 255.4)
-
Step 500
500 (this color)
#558ACE
oklch(62.7% 0.118 255.3)
-
Step 600
600
#3B74BD
oklch(55.6% 0.129 255.7)
-
Step 700
700
#2D61A3
oklch(49.1% 0.12 255.7)
-
Step 800
800
#265084
oklch(42.8% 0.099 255.1)
-
Step 900
900
#24426A
oklch(37.6% 0.078 256.2)
-
Step 950
950
#15273E
oklch(27% 0.049 255.2)
#558ACE with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6E8ED1 | 0.032 |
| Deuteranopia (no green cones) | #5E83CD | 0.020 |
| Tritanopia (no blue cones) | #0099A2 | 0.101 |
| Achromatopsia (no color) | #888888 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #558ACE
#558ACE
oklch(62.7% 0.118 255.3)
- #B17D26
#B17D26
oklch(62.7% 0.118 75.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #558ACE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.034
- Faded Blue #658CBB ΔE 0.035
- Cool Blue #4984B8 ΔE 0.038
- Water Blue #0E87CC ΔE 0.046
- Steel Blue #4682B4 ΔE 0.047
- Soft Blue #6488EA ΔE 0.048
- Off Blue #5684AE ΔE 0.048
- Dusty Blue #5A86AD ΔE 0.049
Use #558ACE in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.